Altera Triple Speed Ethernet MegaCore Function - Manual (Page 77)

Figure 4-29: PTP Frame over UDP/IPv6
Version | Traffic Class | Flow Label
Payload Length
4 Octet
2 Octets
Source IP Address 16 Octets
Destination IP Address 16 Octets
Source Port 2 Octets
Destination Port = 319 / 320 2 Octets
Hop Limit
Next Header = 0x11 1 Octet
1 Octet
Length/Type = 0x86DD
Source Address
Destination Address
2 Octets
6 Octets
6 Octets
Checksum
Length
2 Octets
2 Octets
flagField
correctionField
transportSpecific | messageType
reserved | versionPTP
reserved
1 Octet
1 Octet
1 Octet
2 Octets
8 Octets
reserved 4 Octets
SourcePortIdentify 10 Octets
sequenceId 2 Octets
controlField 1 Octet
logMessageInterval 1 Octet
TimeStamp 10 Octets
extended bytes 2 Octets
CRC 4 Octets
domainNumber
messageLength 2 Octets
1 Octet
MAC Header
UDP Header
IP Header
PTP Header
(1)
0..1500/9600 Octets Payload
Note to Figure 4-29 :
1. For frames with VLAN or Stacked VLAN tag, add 4 or 8 octets offsets before the length/type field.
Altera Corporation Functional Description
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4-41 PTP Frame over UDP/IPv6
UG-01008
2014.06.30